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A115652 Brilliant numbers (A078972) which are the sum of distinct double factorials (A006882). 3
4, 6, 9, 10, 14, 15, 21, 25, 49, 121, 169, 403, 407, 437, 451, 493, 517, 551, 949, 961, 1003, 1007, 1067, 1073, 1079, 1121, 1333, 1343, 1349, 1357, 1387, 1403, 1457, 1501, 3869, 3901, 3953, 4331, 4891, 5183, 5293, 10403, 10807, 11413, 11449 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!.

LINKS

Table of n, a(n) for n=1..45.

EXAMPLE

949 = 13*73 = 9!! + 3!! + 1!!.

CROSSREFS

Cf. A006882, A078972, A115651, A115653, A115654.

Sequence in context: A115654 A036326 A078972 * A337372 A317299 A236026

Adjacent sequences:  A115649 A115650 A115651 * A115653 A115654 A115655

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 28 2006

STATUS

approved

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Last modified March 5 15:22 EST 2021. Contains 341825 sequences. (Running on oeis4.)